Fuel-burning apparatus



Patented Sept. 20, 1921.

10 n 6 v m I UNITED STATES PATENT OFFICE.

ERA C. JAGOBSEN, 01 OAK PARK, ILLINOIS. ASSIGNOR, BY MESNE ASSIGNMENTS, T0 AMERICAN STEAM TRUCK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OI" DELAWARE.

Specification of Letters Patent.

Patented Sept. 20, 1921.

Application filed March 29, 1920, Serial No. 369,800. Renewed May 9, 1921. Serial No. 468,046.

ful Improvements in Fuel-Burning Appa-- ratus, of which the following is a specification.

My invention relates to fuel burning apparatus and has for one of its objects the provision of simple and efficient means for starting and controlling the burning of fuel for tubular boilers, and the like.-

A further object is the provision of simple and efiicient means for causing the fuel to automatically operate an electrical switch member for closing first an ignition circuit and then a blowing circuit in fuel burning mechanism.

A still further objectis the provision of simple and eflicient means for first igniting fuel and then blowing the flame caused by the burning fuel.

Other objects will appear hereinafter.

An embodiment of my invention is illustrated in the accompanying drawlng, form nism used in the-construction.

Referring more particularly to the drawing, I have indicated a valve casing having a valve seat therein with a valve 6 mounted for-cooperation with said seat 5. The valve casing may be provided with a suitable stuffing box 7 for preventing the passage of fuel out around the stem 8 of the valve 6. Extending from the valve casing is a fuel pipe 9 adapted for connection with a source of fuel under pressure, not shown.

The stem 8 extends into a housing 10 in which is mounted a: diaphragm 11. Resting against the diaphragm 11, at one side, is a head 12 secured to the stem 8. At the other side of the diaphragm 11- connected in the housing 10 is a supply pipe 13 adapted to be connected with steam under pressure so that steam coming through said pipe may press against the diaphragm 11.

pipe 13 exceeds thestrength of spring 16 diaphragm 11 will move the stem 8 and valve 6 to close said valve against its seat 5 and cut off the passage of fuel from pipe 9. Extending from the valve casing is a pipe 17 which connects wit-h a cylinder head 18 so that fuel passing through valve seat 5 can pass on through pipe 17 to the interior of cylinder head 18. Attached to the cylinder head 18 is a cylinder 19 and at the other end of the cylinder 19 is a cylinder head 20. Disposed within the cylinder 19 is a piston 21 having a piston rod 22 extending out through head 20 through a acking gland 23.

Intermediate the ends of the cylinder 19 is .an exhaust port 24 which is connected by means of apipe 25 with a fuel spraying nozzle 26 and the latter disposed within a mixing chamber 27. In operation the fuel coming through pipe 17 presses against piston 21, pressing the latter against a spring 28 around the piston rod 22 until said head 21 uncovers the port 2 1. Vhen the piston 21 has uncovered port 24 the fuel is free to pass to nozzle 26. y

I find it advisable to provide some form of by-pass in the cylinder 19 so that the piston 21 can be returned to the position shown, after having uncovered port 24,, by the spring 28. In Fig. 2 I have shown a small groove 29 as being cut in the wall of the cylinder from a point near the end of cylinder 19 in head 18 to a point near the exhaust port 24 so that after fuel valve 6 is closed spring 28 can force the head 21 down to its position shown and the fuel between the head 21 and valve 6 can pass out through the groove 29 into pipe 25 and'nozzle 26. It will be apparentthat many forms of bypass arrangements may be provided. In Fig. 3 I have' shown a small perforation 30 in the head 21 to permit the fuel trapped between head 21 and, valve 6, when the latter is closed, to pass out and permit spring 28 to move the head 21 to the position shown.

I have indicated the nozzle 26 as being mounted in a passage 27 leading from a blower 31 which may be of the centrifugal type having an electric motor 32 connected directly to said blower.' Any other form of blower may be substituted when so desired.

Also, in the wall 27 of the mixing chamber- I have indicated a spark plug 33 of conventional construction mounted in a position to fire fuel blown from nozzle 26.

The motor 32 may be operated from an electric'battery 34 having a circuit 35 which includes said battery and motor. Also, in

the'circuit 35 are two contacts 36, and mounted on the-piston rod 22 is a switch member 37 mountedin a suitable manner with insulation 38 insulating said member 37 from the piston rod. As the piston rod 21 moves 'to uncover port 24, contact member 37 passes between contact members 36, thereby closing the circuit 35 and causing the motor 32 to operate the blower 31.

and causing sparks in the spark plug 33.

An electrical ignition circuit is also provided. The primary circuit 39 of the ignition circuit has one leg connected to battery 34 and the other leg connected to a contact 40 on an insulated base 41 upon which the contacts 36 are mounted. Also, on base 41 is a contact member 40, and 'the contacts 40 and 40 are connected in circuit 39 so that as the switch member 37 moves toward contacts 36 it will pass between cont-acts 40 and 40' causing a circuit to pass through the primary winding of an induction coil 42 The secondary winding 43 of the induction coil is connected to the spark plug 33 and a suitable part of the frame-work, such as at v44, to the wall 27.

-When it is desired to start a fire in a de- The by-pass permits a small amount 0 uel to begin tpassing to nozzle 26 as soon as or shortly a ter the piston 21 starts in its movement toward head 20- and this fuel issues from nozzle 26. The sparks produced inspark plug 33 ignite such fuel. When the p ston 21 has traveled a sufficient distance the swltch member 37 will pass from between contacts 40 and 40 to a position between contacts 36, thereby breaking the ignition circuit and closing the circuit 35 to-the motor operating the blower 31. The devlce W111 then stay in this position until sufficient ste'am pressure has been raised to operate the diaphragm 11 to overcome the strength of spring 16 and move valve 6 against its seat 5 to close the passage of fuel from pipe 9. As soon as the pressure between valve 6 and piston 21 is reduced by mitting another cycle of movements, such as just described. Thus the fire will be auto-' matically controlled to maintain a substantially even steam pressure in pipe 13 until the supply of fuel is cut off from p1pe 9.

I claim 'outwardly and open the valve 6 again,'per- 1. Fuel burning apparatus comprising a blower circuit; an ignition circuit; contacts in said circuits; a switch member; and a member operable by fuel under pressure, I

connected with said switch member and adapted to move the latter from one of said contacts to the other. 7

2. Fuel burning apparatus comprising a fuel valve; a fuel nozzle; fuel-conductlng means between said valve and nozzle; a blower circuit; an ignition circuit, both of said circuits being normally open; and means operable by fuel in said fuel conducting means for closing said circuits, one at a time.

3. Fuel burning apparatus comprising a blower circuit; an ignltion circuit; contacts in said circuits a cylinder; a piston in said cylinder; a piston rod attached to said piston; aswitch member on said piston rod; and means for conducting fuel under pressure to said piston for moving said switch member from the contact in one circuit to the contact in said other circuit.

4. Fuel burning apparatus comprising a blower circuit; an ignition circuit;"contacts in said circuits; a cylinder; a iston in said.

cylinder; a piston rod attache to said piston; a switch member on said pistonrod; means for conducting fuel under pressure to said piston for moving said switch member from the contact in one circuit to the contact in said other circuit; and resilient spaced intake and exhaust ports therein with.

the intake port in communication with said fuel valve and the exhaust port in communication with said burner; a piston in the cylinder; 1!. spring normally holding the pis ton between said ports; and a bypass afi'ording a communication in the cylinder from one side to the other of the piston.

5 6. Fuel burning apparatus comprising a fuel valve; a cylinder having'spaced-apart intake and exhaust ports therein with the intake port in communication with said fuel valve; a piston in the cylinder; a spring nor mally holding the piston between said ports; a bypass affording a communication from one side to the other of the piston in said cylinder; an ignition circuit; and a switch member operable by said piston for opening and closing the ignition ClIClllliv .7. Fuel burning apparatus comprising a cylinder'having an intake port atone end and an exhaust port intermediate its ends; a piston in said cylinder; a spring tending to holdv said piston near the intake end of said cylinder; means for conducting fuel under pressure to said piston for moving the latter against said spring to uncover said exhaust port; an ignition circuit; a blower circuit; contacts in said ignition and blower circuits; and a switch member oper-.

tacts; an ignition circuit including certain 40 other of said contacts; a spring tending to move said piston toward one end of said cylinder; means for closing said fuel valve;

and by-pass means permitting the fuel trapped between said piston and said fuel valve to'pass by-said piston to the exhaust port of said cylinder.

9. Fuel burning apparatus comprisin a fuel valve; a stem on the fuel valve a iaphragm at an end of the valve stem adapted to \close said fuel valve; a spring tending to press said stem toward the diaphragm and hold the valve open; a cylinder connected U with the valve and having an exhaust port intermediate its ends; a piston in. the cylinder; a spring tending to hold the piston adjacent one end of the cylinder; means for conducting fuel under pressure connected with the fuel v alve so that said piston is moved against the action of its adjacent spring to uncover said exhaust port, the last- 1 mentioned spring being adapted to move the piston back over said exhaust port upon the \fuelvalve being closed. 7 I

10. Fuel burning apparatus comprising a blower circuit; an ignition circuit; contacts in said circuit; .a-cylinder; a piston in saidcylinder; a piston'rod attached to said piston; a switch member on said piston rod; and means for conducting fuel under pressure to said piston for moving said switch first to the contact in said ignition circuit and next to the contact in the blower circuit.-' In testimony whereof I'have signed my nameto this 'gpecification on this of March, A. 1920.

ERA o. JAGOBSEIL 25th day 

